Prepare thin specimens for transmission electron microscopy in minutes.

TenuPol-5 facts

  • Scanning function
  • Method Database
  • High specimen quality

The TenuPol-5 is designed for automatic electrolytic thinning of specimens for examination in a transmission electron microscope. Establishing parameters for new materials and storing them in the method database is simple, using the built-in scanning function and additional enhancement functions. The TenuPol-5 consists of two separate units - the control unit and the polishing or thinning unit.

 A perforated specimen for transmission electron microscopy is prepared in a few minutes using a sample with a diameter of 3.0 or 2.3 mm.

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Fast determination of method settings

TenuPol-5 is equipped with a unique scanning function that scans a pre-defined voltage range to determine the current density curve. This curve is used to define the correct polishing voltage for the thinning process, allowing the user to store the parameters in order to find the correct method settings again after a single scan of a new material sample. The TenuPol-5 comes with filter and enhance functions to facilitate finding the correct voltage settings for polishing and etching.

Comprehensive method database

The built-in method database contains 18 Struers methods and up to 200 user methods. The 18 methods consist of eight methods for pre-thinning and ten methods for the final thinning of various materials. This means that the user can prepare a wide range of materials immediately without time-consuming trials. The user can also use the methods in the database as a starting point for developing their own methods for other materials.

High specimen quality

The specimen is polished from both sides simultaneously, thus providing a structure with an absolute minimum of deformation. When the perforation appears, the polishing can automatically be stopped by the infrared detector system, and the specimen is ready for TEM examination. No special operator training is required.


  • TenuPol automatic shut

    Automatic shut‑off

    As soon as a hole appears in the center of the specimen, the process is shut off in accordance with the pre-set light stop value.

    Automatic shut‑off
  • TenuPol pre-thinning


    The basic material with a diameter of 12‑21 mm is pre-thinned using a special specimen holder to a thickness of less than 0.5 mm in an area up to 10 mm in diameter in order to avoid deformations of the finished sample.

  • TenuPol electrolytic punching

    Electrolytic “punching”

    TenuPol-5 enables electrolytic “punching” of several 3.0 mm (or 2.3 mm) specimens from the foil material without introducing any deformation at all.

    Electrolytic “punching”
  • TenuPol chemical thinning

    Chemical thinning

    TenuPol-5 is made of corrosion‑resistant materials, allowing for polishing using most chemicals such as perchloric acid and other highly corrosive electrolytes.

    Chemical thinning
  • TenuPol control unit

    Control unit

    TenuPol-5 consists of two separate units, the control unit and the polishing or thinning unit. The control unit contains the power supply and the programming and monitoring functions. Touchpad operation and a back-lit display of all parameters, such as current, electrolyte temperature, and elapsed thinning time, enables monitoring of the entire process

    Control unit
  • TenuPol polishing thinning

    Polishing/thinning unit

    The separate unit design enables the polishing/thinning unit to be placed away from the control unit in a fume cabinet, for example. The TenuPol-5 comprises two electrolyte reservoirs, an insulated one for use with the built‑in cooling coil, and an uninsulated one for cooling the electrolyte.

    Polishing/thinning unit


Model types


Control unit, with electronic thermometer and adapter for the connection of TenuPol polishing unit, with specimen holder for three mm dia. specimens, sets of jets, pump, cooling coil, insulated PVC container, non-insulated PVC-container, and a built-in photo cell.

Struers’ equipment is in conformity with the provisions of the applicable international directives and their appurtenant standards.
Struers’ products are subject to constant product development. Therefore, we reserve the right to introduce changes to our products without notice.

Technical Data

TenuPol Technical Data Sheet

Struers Technical Data Sheets are designed to help you make the best choice of equipment for your particular purpose. You can find important information such as capacity and performance specifications, dimensions, weight, electrical data, noise levels, ambient conditions, and safety. In many cases you can also obtain an overview of accessories offering higher capacity and performance.

Download Technical Data Sheet
Technical Data Sheet

Ensuring certainty with Struers tailored support services

To optimize your processes, enhance your quality control performance and ensure equipment availability, we offer a wide range of services, training and support.

From preventive maintenance to training and process analysis, our Service Plans, Service Packages and Single Services are delivered by experienced technical service engineers and application specialists – and can be tailored to match your needs.

Correct preparation solutions

"True structures require proper and correct applications. Different material properties require broad application knowledge. Struers application specialists are experts in optimizing preparation methods, because application knowledge is necessary to select the correct preparation solutions. Your material – our application solutions.”

Birgitte Nielsen
Application Specialist, Struers ApS

Go to Knowledge

M8 Quote Birgitte


Don’t make do with what we say! Look for the truth in the experiences of the people who use our equipment and knowledge. We asked a few of our loyal customers to tell us what they think is most important about Struers.

Ideal Fasteners Logo
The backbone of our quality assurance program, our Struers laboratory promotes ease of use, resulting in high output and efficient use of our human resources and huge time savings. In my opinion, Struers equipment provides the most efficient and consistent method for examining the quality of our fastener products. Ideal Fasteners Pty. Ltd. (Australia) Neville Deutscher Managing Director
Grinding Media Moly Cop Logo
We have always experienced extremely repeatable and consistent, high-quality results. The consistency and reliability of our Struers cutting machines was instrumental in our decision to install a similar Struers system in our plant in Indonesia. Grinding Media, Moly-Cop (Australia) Glenn Sullivan Technical Developments Manager
BRP Powertrain GmbH Logo
We are extremely satisfied with the highly skilled service delivered by Struers. They always meet our needs quickly and efficiently. BRP Powertrain GmbH & Co. KG (Austria) Herr Thomas Brunmair Supervisor Material Lab